you can always just translate everything you see in the game and make a post about it. if toady sees it he might do something. no one should expect toady to go out of his way to comply to any demands without anything backing them up.
apart from that, i highly doubt anyone who cant even speak a little english, while possessing an internet connection, would actually become an active player of this game.
uh, putnam actually ninjad me with a solution, while im just saying i dont think its necessary. ill post anyways...
As Trif said, better translation support is planned. Obviously Toady won't go and translate everything himself. It's quite likely he won't add in fan translations if he has no way to judge their quality. But what he can do is externalize the strings and basic grammar the game uses, allow more grammatical cases and so on in the raws, and allow fans to translate them and distribute them via DFFD. It's quite a project, and won't happen anytime soon, but there is a demand for it. While I would not use a German version, other Germans, or other non-native English speakers, aren't fluent enough in English to play a game of this complexity in English. The German indiegameforum has a thread that's dedicated to getting the Multilangual Dwarf Fortress suggestion to a higher number, for example.
Insolor's utility looks like a good start for unofficial patches, sure. But of course it's not perfect since it's just the text (and in some cases, translation length is fixed, which isn't likely to work well with most languages; not sure in which instances it's used, but even if its in contexts where abbreviations or padding are appropriate, it depends on how well the word can be abbreviated), and not the grammar used to build sentences from fragments.
Core54, TRANSLATION SUPPORT, (Future): Announcements and other interface text needs to come out of the game and be placed in an editable format to support any potential translators, though current font implementations restrict this process at the moment if non-ASCII characters are to be involved.